Programming Z Difference: ABS(G55-G54)

[mark_mollere_01]

I'd like to square stock so that the part is 2.000" in Z. My thought is with the following:

• Set G54 Z to the top of the part.
• Set G55 Z to the surface the part is sitting on.
• Get the absolute value of the difference between G54 Z and G55 Z.
• Perform a facing operation on G54 Z removing all but 2.000".

Is this possible or is there a better method?